Add tox labels for lint, format and unit tests

tox.ini

@@ -1,6 +1,11 @@
 [tox]
-skipsdist=True
+skipsdist = True
 envlist = clean,ansible{2.12,2.13}-py{38,39,310}-{with_constraints,without_constraints},linters
+# Tox4 supports labels which allow us to group the environments rather than dumping all commands into a single environment
+labels =
+    format = black, isort
+    lint = complexity-report, black-lint, isort-lint, flake8-lint
+    units = ansible{2.12,2.13}-py{38,39,310}-{with_constraints,without_constraints}
 
 [testenv]
 description = Run the test-suite and generate a HTML coverage report
@@ -34,6 +39,30 @@ deps =
 commands =
   black {toxinidir}/plugins {toxinidir}/tests
 
+[testenv:black-lint]
+deps =
+  {[testenv:black]deps}
+commands =
+  black -v --check --diff {toxinidir}/plugins {toxinidir}/tests
+
+[testenv:isort]
+deps =
+  isort
+commands =
+  isort {toxinidir}/plugins {toxinidir}/tests
+
+[testenv:isort-lint]
+deps =
+  {[testenv:isort]deps}
+commands =
+  isort --check-only --diff {toxinidir}/plugins {toxinidir}/tests
+
+[testenv:flake8-lint]
+deps =
+  flake8
+commands =
+  flake8 {posargs} {toxinidir}/plugins {toxinidir}/tests
+
 [testenv:linters]
 deps =
   {[testenv:black]deps}